Castlegate is a small area within Aberdeen City, Scotland, located centrally at the east end of the city's main thoroughfare Union Street. Aberdeen's Castlegate in 1870 had two Russian Cannons on display. These were captured at Sebastopol during the Crimean War and were sent to Aberdeen to commemorate the victory.

The Castlegate, Aberdeen also contained the statue of the Duke of Gordon. One of the oldest photographs from circa. 1884 shows crowds who were gathering to catch a glimpse of a Russian cannon below the statue. The Market Cross is in the vicinity together with the Record Office. This was demolished in the 1890s for the building of the Salvation Army Citadel. The caption on the statue says, "George, Fifth and Last Duke of Gordon, born 1770, died 1836. First Colonel 92nd Gordon Highlanders". The Duke of Gordon Statue had found its way to Golden Square, Aberdeen, by 2016. The Crimean Cannons had a less fortunate future and are now lost.

The two cannons were first sent to Aberdeen in the 1850s and displayed at Castlegate until 1874 (1884?) when the Russian Emperor came to visit Aberdeen. To avoid offending the Emperor, they were diplomatically moved to Robert Gordon's Hospital where they remained until the 1940s. They were then scrapped as part of the WWII effort to salvage metal for armaments.